linux-kernel - Re: [RFC Patch net-next v2 06/15] net: dsa: microchip: get P_STP_CTRL in ksz_port_stp_state by ksz_dev

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Date:   Mon, 13 Jun 2022 12:31:16 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     Arun Ramadoss <arun.ramadoss@...rochip.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Russell King <linux@...linux.org.uk>
Subject: Re: [RFC Patch net-next v2 06/15] net: dsa: microchip: get
 P_STP_CTRL in ksz_port_stp_state by ksz_dev_ops

On Mon, May 30, 2022 at 04:12:48PM +0530, Arun Ramadoss wrote:
> At present, P_STP_CTRL register value is passed as parameter to
> ksz_port_stp_state from the individual dsa_switch_ops hooks. This patch
> update the function to retrieve the register value through the
> ksz_dev_ops function pointer.
> And add the static to ksz_update_port_member since it is not called
> outside the ksz_common.
> 
> Signed-off-by: Arun Ramadoss <arun.ramadoss@...rochip.com>
> ---
>  drivers/net/dsa/microchip/ksz8795.c    |  9 +++++----
>  drivers/net/dsa/microchip/ksz9477.c    | 10 +++++-----
>  drivers/net/dsa/microchip/ksz_common.c |  9 +++++----
>  drivers/net/dsa/microchip/ksz_common.h |  5 ++---
>  4 files changed, 17 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/net/dsa/microchip/ksz8795.c b/drivers/net/dsa/microchip/ksz8795.c
> index 8657b520b336..e6982fa9d382 100644
> --- a/drivers/net/dsa/microchip/ksz8795.c
> +++ b/drivers/net/dsa/microchip/ksz8795.c
> @@ -920,9 +920,9 @@ static void ksz8_cfg_port_member(struct ksz_device *dev, int port, u8 member)
>  	ksz_pwrite8(dev, port, P_MIRROR_CTRL, data);
>  }
>  
> -static void ksz8_port_stp_state_set(struct dsa_switch *ds, int port, u8 state)
> +static int ksz8_get_stp_reg(void)
>  {
> -	ksz_port_stp_state_set(ds, port, state, P_STP_CTRL);
> +	return P_STP_CTRL;
>  }

Since there's nothing dynamic about get_stp_reg(), can the STP register
location stay in struct ksz_chip_data?